You mistake me, as most do. I don't have extensive knowledge of film or any other topic, hence my current tagline. What I do have is very broad knowledge about a lot of what to me are very interesting things. I cover an area three miles wide but one inch deep. If one of the pieces of useless knowledge gets bumped into I haul it out and sound profound. Most people do this. I have just collected more useless knowledge about more topics than is the norm. But expertise or extensive knowledge? Hardly.
I was really sincere when I said I envied you. That sort of opportunity would have been neat and the questions you got to ask were probably above average, witness the SAG comment (not many would have touched on that... did you go so far as to touch on Patty Duke's tenure as head of SAG?)
As a college textbook rep in the seventies, we used that line of miles wide but only inches deep. Learned it from our District Manager, who was a bit deeper and miles wider, mentally.